Paper 2022/034

From Privacy-Only to Simulatable OT: Black-Box, Round-Optimal, Information-theoretic

Varun Madathil, North Carolina State University
Chris Orsini, North Carolina State University
Alessandra Scafuro, North Carolina State University
Daniele Venturi, Sapienza University of Rome

We present an information-theoretic transformation from any 2-round OT protocol with only game-based security in the presence of malicious adversaries into a 4-round (which is known to be optimal) OT protocol with simulation-based security in the presence of malicious adversaries. Our transform is the first satisfying all of the following properties at the same time: – It is in the plain model, without requiring any setup assumption. – It only makes black-box usage of the underlying OT protocol. – It is information-theoretic, as it does not require any further cryptographic assumption (besides the existence of the underlying OT protocol). Additionally, our transform yields a cubic improvement in communication complexity over the best previously known transformation.

Available format(s)
Publication info
Published elsewhere. Conference on Information-Theoretic Cryptography (ITC 2022)
oblivious transfer malicious security plain model round-optimal black-box
Contact author(s)
vrmadath @ ncsu edu
crorsini @ ncsu edu
ascafur @ ncsu edu
venturi @ di uniroma1 it
2022-07-19: last of 2 revisions
2022-01-14: received
See all versions
Short URL
Creative Commons Attribution


      author = {Varun Madathil and Chris Orsini and Alessandra Scafuro and Daniele Venturi},
      title = {From Privacy-Only to Simulatable OT: Black-Box, Round-Optimal, Information-theoretic},
      howpublished = {Cryptology ePrint Archive, Paper 2022/034},
      year = {2022},
      note = {\url{}},
      url = {}
Note: In order to protect the privacy of readers, does not use cookies or embedded third party content.